
/**
 * StringUtils
 */
class StringUtils {
    public static isBlank(input: string): Boolean {
        return input && input.trim().length > 0;
    }
    public static isNotBlank(input: string): Boolean {
        return !StringUtils.isBlank(input);       
    }    
    // public static contains(input: string): Boolean {
    //     return StringUtils.isNotBlank(input) && input
    // }
}

export class aaa extends String{

    phoenix(){
        return this.concat(' phoenix');
    }

}
